A lot of shit is heritable by the way.
We all accept the physical traits that aren't politically incorrect. We accept skin colour is heritable even though there are environmental factors. We accept height is 80% heritable in adults eventhough the environment plays a role. We accept SNP mutations such as sickle cell anemia are not heritable are related to certain races. We accept the differences in bone density between the races and that is heritable eventhough environment plays a role. We accept differences in everything EXCEPT the brain, a physical organ.
Now I know that we don't know the genes that directly increase IQ although a few hundred genes have been identified as very predictive. Funnily enough when race isn't mentioned its accepted IQ is 80% heritable but as soon as you mention different demographic groups ie races there's a complete denial of it.
Political views are heritable too although we haven't narrowed down the exact genes. It doesn't need to be narrowed down.
All of this is accepted in the scientific community but no one wants to admit it when race is mentioned.